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ISO - 7933

Ergonomics of the thermal environment — Analytical determination and interpretation of heat stress using calculation of the predicted heat strain

active, Most Current
Organization: ISO
Publication Date: 1 July 2023
Status: active
Page Count: 36
ICS Code (Ergonomics): 13.180
scope:

This document describes a model [the predicted heat strain (PHS) model] for the analytical determination and interpretation of the thermal stress (in terms of water loss and rectal temperature) experienced by an average person in a hot environment and determines the maximum allowable exposure times within which the physiological strain is acceptable for 95 % of the exposed population (the maximum tolerable rectal temperature and the maximum tolerable water loss are not exceeded by 95 % of the exposed people).

The various terms used in this prediction model and, in particular, in the heat balance, show the influence of the different physical parameters of the environment on the thermal stress experienced by the average person. In this way, this document makes it possible to determine which parameter or group of parameters can be changed, and to what extent, in order to reduce the risk of excessive physiological strain.

In its present form, this method of assessment is not applicable to cases where special protective clothing (e.g. fully reflective clothing, active cooling and ventilation, impermeable coveralls) is worn.

This document does not predict the physiological response of an individual person, but only considers average persons in good health and fit for the work they perform. It is therefore intended to be used by, among others, ergonomists and industrial hygienists, as the outcomes can require expert interpretations. Recommendations about how and when to use this model are given in ISO 8025.

Document History

7933
July 1, 2023
Ergonomics of the thermal environment — Analytical determination and interpretation of heat stress using calculation of the predicted heat strain
This document describes a model [the predicted heat strain (PHS) model] for the analytical determination and interpretation of the thermal stress (in terms of water loss and rectal temperature)...
August 15, 2004
Ergonomics of the thermal environment Analytical determination and interpretation of heat stress using calculation of the predicted heat strain
This International Standard specifies a method for the analytical evaluation and interpretation of the thermal stress experienced by a subject in a hot environment. It describes a method for...
July 15, 1989
Hot Environments - Analytical Determination and Interpretation of Thermal Stress Using Calculation of Required Sweat Rate
A description is not available for this item.

References

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